I started recently to work with CFX. I am trying to implement a free-surface model.
I have already defined the geometry and the mesh. When I was defining the geometry I used the slice operation in order to have different types of meshes for air and water. However when I set the mesh I found that I could have a very good global mesh (for air and water) using exactly the same mesh (Tetrahedrons elements with Patch Independent Algorithm).
At the present moment I have launched the CFX-Pre. My main questions are (I am following the tutorial "free surface flow over a Bump"):
1) When I am creating the domain I`m giving the basic settings for air and basic settings and fluid models for water. However when I check their features in the "Automatic Default Domain " CFX assumes equal settings for air and water...:confused:
2) How can I define periodic boundary conditions?Basically I just want to give to the model the water height and the inclination of the bed and I want that the model compute the discharge...
1. Follow the tutorial again. You should only have 1 domain that contains 2 fluids, rather than 2 domains with 1 fluid each
2. The water height is part of the solution, you cannot specify it (expect at inlet boundaries).
Thanks a lot for your suggestions. Just one more question. Should I review the mesh that I have created or can I transform in CFX-pre the mesh in order to have just a single domain?
You can have a single domain containing both pieces. However, the mesh would need to match (i.e. not a GGI) since GGI's can have problems when aligned to a free surface.
temperature on the botttom
hello everybody, i´m modelling the free surface too
i have the following problem:
the bottom should have 2 different temperatures! how i can make it with the if -function?
my bottom is 40 mm on the length.so how how can i declare it on the middel of the bottom without having a temperature-switch?it should be 25[C] left and 30[C] right from the middel!
maybe with a linear function?
in cfx 11 see tutorial 7 bondary detail for inlet and Creating Expressions part
and instead of normal velocity in inlet select static pressure and put UpPress function for value
i think it works
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